KR20100101459A - The surge tank having cooling and heating apparatus and controlling system thereof - Google Patents

Abstract

PURPOSE: A cooling and heating apparatus with a closed expansion tank and a control system thereof are provided to achieve efficient and economical management of energy through remote control of pressure and water level of the expansion tank. CONSTITUTION: A cooling and heating apparatus comprises a circulation pipeline(206), an expansion tank(210), a pressure holding device, a supplementary water tank(240), a pressure controller(280), a water level controller(270), and an integrated controller(260). The pressure holding device is connected to the expansion tank through a pipeline network and supplies media for maintaining the pressure of the expansion tank. The supplementary water tank is connected to the expansion tank through a supply line with a water supply pump and a supplementary valve and a return line with a return valve and supplies supplementary water to the expansion tank according to the driving of the water supply pump. The pressure controller keeps the pressure of the expansion tank uniform. The water level controller controls the water level of the supplementary water tank and the expansion tank to the proper level. The integrated controller maintains uniform pressure and water level of the expansion tank and uniform water level of the supplementary water tank in connection with the pressure controller and the water level controller.

Description

The Surge Tank Having Cooling and Heating Apparatus And Controlling System Thereof}

The present invention relates to a heating and cooling device equipped with a closed expansion tank and a control system thereof. More specifically, it is possible to increase the safety of the expansion tank by minimizing the vibration and shock generated when the heat medium present in the expansion tank is returned to the circulation pipe line. It relates to a heating and cooling device equipped with a closed expansion tank in which control is performed and a control system thereof.

In general, the district heating and cooling system is activated by incinerators, combined cycle cogeneration. In district heating and cooling, a heat source facility (eg cogeneration plant) concentrated in residential, commercial or public customers within a city or a certain area generates heat required for cooling, hot water supply, and air conditioning. By supplying heat produced economically from a centralized heat source facility through a pipe network without a gas boiler, energy can be managed efficiently, so it can have the maximum effect using the minimum energy.

This cooling and heating system supplies the district heating and heating medium produced in the heat source facility to the customer heat exchanger chamber through a well-maintained pipe network. The heat medium supplied to the heat exchanger chamber transfers heat to the internal circulation heat medium of the customer through a separate customer heat exchanger, and is then recovered to the heat source facility. The consumer circulating water, which receives heat from the heat exchanger chamber, is supplied to each floor of each household and building.

As the heat medium for district heating and heating, water is mainly used. Due to the characteristics of district heating and heating, water is generally circulated through a pipe by heating water at a high or high temperature (over 100 ° C).

1 is a schematic view showing a circulating air conditioning system equipped with a hermetic expansion tank according to the prior art.

As shown, the circulating air-conditioning system according to the prior art is that the heating medium heated from the heat source (102) is supplied and recovered to the customer's air-conditioning unit 104 or the neighboring heat exchanger through the circulation piping system 110, An expansion tank 120 that temporarily receives the expanded heat medium branched from one side of the pipe system 110 and returns it to the circulation pipe system 110 when the heat medium contracts, and the heat medium flows into the expansion tank 120. It is installed in the pipe 122, the pressure conversion means 130 for converting the pressure of the pipe water pressure reduced pressure, the heat medium is installed in the return pipe 140 through which the heat medium flows from the expansion tank 120 to the circulation piping 110 when the heat medium contracts Is connected to one side of the direction control means 150 and the expansion tank 120 to control the direction so that only flow in one direction includes a nitrogen supply unit 160 for injecting nitrogen into the expansion tank 120 The features.

Here, the pressure converting means 130 is configured such that the pressure holding valve 132 and the pressure reducing valve 134 and the electric valve 136 connected in series are connected to each other, in particular the pressure holding valve 132 and the pressure reducing valve ( 134 and the electric valve 136 is configured in parallel with a constant pressure difference.

In addition, the direction control means 150 is composed of a return pump 152 for applying a pressurized pressure of the heat medium returned from the expansion tank 120 and a check valve 154 for controlling the heat medium to flow only in one direction.

On the other hand, from the viewpoint of efficient use and saving of energy, not only large-scale district heating and cooling, but also small community energy supply systems (CES) have been activated, and circulation linked to district heating or CES in resource recovery facilities such as incinerators. A pipe network such as the piping system 110 is provided, and when the various valves installed in the circulation piping system 110 are opened or closed rapidly, or when the pump is stopped due to a start or stoppage of the pump, the flow rate and the pressure change rapidly. There was a problem that a transient condition occurs.

This transient is called a water hammer. As a result of this water shock phenomenon, the pressure in the pipe is lowered below the saturated steam pressure of water and vapor is generated according to the shape of the circulation circulation system 110 due to the propagation of the pressure wave caused by the sudden flow change in the pipe. In the process of recombination (Column Separation & Return) there was a problem that the collapse or breakage of the circulation piping 110 due to the shock wave occurs.

However, the air-conditioning system according to the related art described above has solved the transient phenomenon occurring in the expansion tank 120 which is commonly used through the pressure converting means 130 and the direction control means 150, but the pressure converting means. There is a problem in that the configuration of the 130 is complicated and in case of emergency, the operator has to adjust manually so as not to cope with the transient phenomenon properly.

In addition, even if a transient phenomenon occurs, there is a problem that must be coped with after a problem such as collapse or breakage of the pipe line is not configured to warn it.

That is, the air-conditioning system according to the prior art is provided with a pressure converting means 130 and a direction control means 150, etc. in order to prevent a transient phenomenon, but the pressure conversion means 130 and the direction control means 150 Since the configuration is very complex and excessively installed, the installation cost for the installation of the expansion tank 120 must be increased, and the installation work time can not only be used for a long time. .

In order to solve this problem, the present invention manages the pressure and the water level of the expansion tank through a remote control, so that it can be installed even in an area where the expansion tank such as the mountainous area is somewhat unreasonable, through efficient energy management and use The purpose is to save energy.

In addition, the present invention includes a pressure control pipe line and a pressure control means between the expansion tank and the circulation pipe line to minimize the vibration, shock, etc. generated when the heat medium is supplied to the expansion tank in the circulation pipe line to increase the safety of the expansion tank. The purpose is to improve the reliability of the expansion tank.

In addition, the present invention by using the high pressure steam produced in the heat source facilities as a medium for maintaining the pressure inside the expansion tank at a constant pressure, it is possible to maintain the pressure of the expansion tank even without a separate configuration for maintaining the pressure of the expansion tank. Therefore, it is possible to reduce the installation cost of the expansion tank, it is possible to utilize the high-pressure steam generated from the heat source facilities, and the purpose is to save energy.

The present invention is provided with a closed expansion tank connected to the heat source facility and the heating and cooling device, including a circulation pipe line installed with a circulation pump, an expansion tank installed at the end of the pressure control pipe line installed in the branch pipe of the circulation pipe line. In the circulation air-conditioning system, the pressure tank is connected to the expansion tank through a pipe network for supplying a medium for maintaining the pressure of the expansion tank; A replenishment tank connected to the expansion tank, a replenishment line having a feedwater pump and a replenishment valve, and a recuperative line having a retrieval valve, respectively, and supplying replenishment water to the expansion tank according to the operation of the feedwater pump; A pressure regulating control unit for maintaining the pressure of the expansion tank in a constant state in association with a pressure sensor detecting the pressure in the expansion tank and the pressure of the medium supplied to the expansion tank; A level control controller installed in the expansion tank and the replenishment water tank, respectively, to adjust the level of the expansion tank and the replenishment water tank to an appropriate level by interlocking with a level control sensor for detecting a level; And an integrated control unit for controlling the pressure control unit and the water level control unit so that the pressure and the water level in the expansion tank and the water level in the replenishment tank are maintained at a constant state in association with the pressure control unit and the water level control unit. It provides a circulating air-conditioning system equipped with a closed expansion tank.

As described above, according to the present invention, the pressure and the water level of the expansion tank can be managed by remote control, so that it can be installed even in an area where the expansion tank such as the mountainous area is somewhat unreasonable, thereby efficiently managing and using the energy. There is an effect to save energy through.

In addition, according to the present invention, by providing a pressure control pipe line and a pressure control means between the expansion tank and the circulation pipe line to minimize the vibration, shock, etc. generated when the heat medium is supplied to the expansion tank in the circulation pipe line of the expansion tank There is an effect of improving the reliability of the expansion tank due to increased safety.

In addition, the present invention by using the high pressure steam produced in the heat source facilities as a medium for maintaining the pressure inside the expansion tank at a constant pressure, it is possible to maintain the pressure of the expansion tank even without a separate configuration for maintaining the pressure of the expansion tank. Therefore, it is possible to reduce the installation cost of the expansion tank, it is possible to utilize the high-pressure steam generated in the heat source facilities, etc., it is effective in saving energy.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the elements of each drawing, it should be noted that the same reference numerals are used to refer to the same elements even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Figure 2 is a schematic view showing a circulating cooling and heating system with a closed expansion tank according to a preferred embodiment of the present invention, Figure 3 is a circulation type with a closed expansion tank according to a preferred embodiment of the present invention 4 is a block diagram schematically showing a cooling and heating system, and FIG. 4 is a schematic view showing a pressure regulating means according to a preferred embodiment of the present invention.

As shown, the circulating air-conditioning system equipped with a closed expansion tank according to a preferred embodiment of the present invention is a heat source facility 202 for heating the circulating water and a cooling and heating device 204 for heating and cooling through the heated circulating water. Circulation pipe line 206 for connecting the supply pipe, the expansion tank 210 for controlling the pressure of the circulation pipe line 206 by connecting with the circulation pipe line 206, and supply water according to the water level in the expansion tank 210. Pressure maintaining device 250 for supplying the replenishing water tank 240 and the medium for maintaining the pressure in the expansion tank, the circulation water pipe line 208, the expansion tank 210, the replenishment water tank 240 It is configured to include an integrated control unit 260 configured to check and adjust the pressure or the water level and the like, and to remotely monitor and control it from the outside such as the central monitoring server 430.

The circulation pipe line 206 is connected to a heat source facility 202 such as an incinerator, a cogeneration plant for district heating and the like, and a circulation network and circulation to the air-conditioning unit 204 installed in buildings in various districts. In particular, the circulation pipe line 206 is connected to the pressure control pipe line 205 through the branch pipe, and is supplied to the end of the pressure control pipe line 205 by heating the heating medium, that is, heating. It is connected to the expansion tank 210 for adjusting the expansion pressure of the circulated water.

Here, the expansion tank 210 is connected to the distal end side of the branch pipe connected to one surface of the circulation pipe line 206 serves to adjust the expansion pressure of the circulation pipe line 206, in the heat source facility 202 When the heated heating medium is circulated through the circulation pipe line 206, the expansion pipe line 206 rises above an appropriate pressure due to the expansion pressure generated as the volume expands due to the heat, and in this case, it is an incompressible fluid. Since the circulation pipe line 206 may be partially damaged or broken by the expansion pressure of the heat medium, the expanded heat medium is temporarily accommodated to adjust the pressure of the circulation pipe line 206.

Here, the pressure control pipe line 205 is a pipe network provided between the expansion tank 210 and the circulation pipe line 206, using the heat of the circulating water (heat medium) heated in the consumer of various buildings, or a heat source facility. When the supply of circulating water is lowered due to the decrease or stop of operation of 202, the supply of heated circulating water is reduced, and as a result, the expansion pressure in the circulation pipe line 206 is reduced, so that the heat medium temporarily stored in the expansion tank 210 is provided. To return through the pressure control pipe line 205.

That is, when the circulating water (heat medium) heated by the heat source facility 202 is circulated through the circulation pipe line 206, if the pressure in the circulation pipe line 206 is increased due to the expansion pressure of the heat medium, the pressure regulation pipe line 205 is introduced into the expansion tank 210, and when the pressure in the pipe of the circulation pipe line 206 is restored to normal, the heat medium is returned to the circulation pipe line 206 through the pressure control pipe line 205. will be.

The expansion tank 210 is connected to a pressure maintaining device 250 for supplying a medium for maintaining the internal pressure of the expansion tank 210 and a supply water tank 240 for supplying supply water.

The feed water tank 240 has a water supply pump 242 so that the water level in the expansion tank 210 reaches the minimum allowable limit, or when the water level in the expansion tank 210 can be maintained at an appropriate limit at all times. It is connected to the expansion tank 210 through the configured supply line 244 to replenish the replenishment water.

In addition, the pressure maintaining device 250 is a device for supplying a medium for maintaining a constant pressure to the inside of the expansion tank 210 to maintain a proper pressure state in the expansion tank 210, expansion tank 210 If the pressure in the) is outside the minimum limit of the allowable pressure is to supply the pressure maintaining medium in the expansion tank 210 in the pressure maintaining device 250 to maintain the pressure of the expansion tank 210 in a stable allowable pressure state.

Here, the medium used to maintain the pressure in the expansion tank 210 may be compressed air, nitrogen, and the like, but is not limited thereto, and high pressure steam generated when heating the circulating water in the heat source facility 202 may be used. Could be

In other words, by supplying compressed air or nitrogen by connecting a compressor or a nitrogen generator generating nitrogen to the expansion tank 210 and supplying compressed air or nitrogen, the pressure of the expansion tank 210 can be maintained at an appropriate state. However, in the present invention, by configuring the steam supply unit 230 is connected to the heat source facility 202 so that the high-pressure steam generated when generating the heat medium in the heat source facility 202 can enter the expansion tank 210, Since a separate component is not required to generate the heat, the cost required for the installation of the circulating air-conditioning unit installed with the expansion tank 210 may be reduced, and since the high pressure steam generated in the heat source facility 202 is used. Energy can be saved.

In addition, when the pressure in the expansion tank 210 is out of the maximum allowable pressure in the expansion tank 210, a discharge line 212 for discharging the supplied high-pressure steam is configured separately, wherein, in the discharge line 212 It is preferred that the pipe network and the discharge valve 214 is provided.

The air-conditioning and heating device provided with the hermetic expansion tank 210 of the present invention as described above is pressure-controlling unit 280 and the water level control to maintain the pressure in the expansion tank 210 in a constant state in conjunction with the pressure sensor 282 The water level control controller 270 to check the state of the water level transmitted from the water level control sensor 272 in conjunction with the sensor 272 so that the water level in the expansion tank 210 and the replenishment water tank 240 always maintains an appropriate level. And an integrated control unit 260 interlocked with the pressure control unit 280 and the water level control unit 270.

Here, the pressure sensor 282 is installed on one surface of the expansion tank 210 and the pressure maintaining device 250, respectively, and detects the pressure of the expansion tank 210 and the pressure maintaining device 250 to pressure the detected data. The pressure control control unit 280, the pressure control control unit 280 according to the data transmitted by the pressure sensor 282 by the pressure control of the expansion tank 210 or by a predetermined data value of the pressure maintaining device 250 At the same time to determine whether to operate or to transmit it to the integrated control unit 260.

That is, the pressure sensor 282 installed on one surface of the expansion tank 210 detects the pressure in the expansion tank 210 and transmits the sensed data to the pressure regulation control unit 280, and the pressure regulation control unit 280 Comparing and analyzing the data on the pressure in the expansion tank 210 transmitted by the sensor 282 and the pressure data of the predetermined expansion tank 210 to be transmitted to the integrated control unit 260, the integrated control unit 260 maintains the pressure It is determined whether to supply a pressure maintaining medium (high pressure steam) from the device 250 or discharge it through the discharge line 212, and when the medium is supplied, the pressure valve control unit 280 operates the supply valve 252. At the time of discharging the medium, the operating signal of the discharge valve 214 is transmitted to the pressure regulating control unit 280.

In addition, the pressure sensor 282 formed in the pressure maintaining device 250 detects the pressure of the medium (high pressure steam) supplied into the expansion tank 210 and supplies it according to the pressure of the medium supplied into the expansion tank 210. After confirming the supply amount of the medium to be transmitted, the data about this is transmitted to the integrated control unit 260.

The water level control sensor 272 is installed in each of the expansion tank 210 and the replenishment water tank 240, and when the water level of the expansion tank 210 reaches the highest water level out of an appropriate level, the water level control sensor 272 does this. After detecting and notifying the water level control controller 270, the water level control controller 270 drives the recovery valve 248 in the same way as the pressure control controller 280 according to the data provided from the water level control sensor 272 to recover the line ( 208 recovers the circulating water in the expansion tank 210, and when the water level in the expansion tank 210 reaches the lowest water level, the feed water stored in the feed water tank 240 is supplied to the feed water pump 242, the supply valve ( 243) and supply of supply water through the supply line 244.

The integrated control unit 260 is a plurality of valves installed in the circulation pump 296 and feed water pump 242 and the circulating air-conditioning unit by the data provided by the pressure control unit 280 and the water level control unit 270. It determines whether the operation for, and transmits it to the pressure control control unit 280 or the water level control control unit 270.

That is, the pressure control controller 280 receives a signal for the strength of each pressure from the pressure sensor 282 installed on one surface of the expansion tank 210 and the pressure sensor 282 installed in the pipe network of the pressure maintaining device 250. After receiving and comparing the data and the predetermined data (pressure, level of the expansion tank 210, proper supply amount and pressure of the supplied medium, etc.) of the signal, and grasp the current state, and then to the integrated control unit 260 By transmitting, it determines the supply or discharge of high pressure steam, such as the pressure maintaining medium in the expansion tank 210, and can check and adjust this in the central monitoring server 430 interworking with the integrated control unit 260 through a wired or wireless network. To do so.

In addition, the water level control controller 270 is transmitted from the water level control sensor 272 in conjunction with the water level control sensor 272 to measure the level of the current level by measuring the water level in the expansion tank 210 and the feed water tank 240. By checking the state of the water level to ensure that the water level in the expansion tank 210 and the replenishment water tank 240 is always at an appropriate level.

Like the pressure control controller 280, the water level control controller 270 transmits information on the water level in the expansion tank 210 and the replenishment water tank 240 from the water level control sensor 272 to the water level in the expansion tank 210. It receives the data for, and compares and analyzes the data to operate the feed water pump 242 and the supply valve 243 connected to the feed water tank 240. In addition, by identifying the state of the replenishment water in the replenishment tank 240 to maintain the level of the water level at all times in the replenishment tank 240 at the same time, the integrated control unit 260 to receive the signal received from the water level control sensor 272 Will be sent to.

As described above, the integrated control unit 260, in conjunction with the pressure control unit 280 and the water level control unit 270, pressure in the expansion tank 210 transmitted from the pressure control unit 280 and the water level control unit 270. And a circulating pump for transmitting the water level in the supply water tank 240 to the central monitoring server 430 through the wired / wireless network and simultaneously circulating the heated circulating water circulated in the circulation pipe line 206 more rapidly. 296 and the feed water pump 242 and supply valve 252, discharge valve 214, supply valve 243, recovery valve which is driven when the replenishment water from the feed water tank 240 to the expansion tank 210 It is determined whether the operation of a plurality of valves, such as (248).

The integrated control unit 260 transmits the information on the pressure and the water level, which are transmitted from the pressure control unit 280 and the water level control unit 270, to the preset maximum pressure and level and approximate values or higher or higher information. Or, if information of the minimum pressure and water level and the approximate value or lower pressure and water level is transmitted to the central monitoring server 430 and at the same time through the field display unit 410 and the alarm sound generating unit 420 At the same time the notification to the worker who is working in the central monitoring server 430 is preferably to be made quick response.

Here, the display unit 410 is a display device that is commonly used, and displays the information such as the reference pressure, the highest allowable pressure, the lowest allowable pressure, the highest pressure and the lowest pressure to maintain the most stable pressure and at the same time maintain the most stable water level. Information such as reference level, maximum allowable level, minimum allowable level, highest level and minimum level should be displayed.

On the other hand, the central monitoring server 430 is connected to the integrated control unit 260 through a wired or wireless network, and confirms the data transmitted from the integrated control unit 260, whether this data is a signal associated with the pressure control control unit 280, water level After determining whether it is a signal related to the adjustment control unit 270, the analyzed data is analyzed, and the data of the component requiring control is transferred to the integrated control unit 260, thereby adjusting the pressure control unit 280 or the water level control unit 270. Control the components that need to control the opening and closing of a plurality of valves installed in the circulating air conditioning system.

For example, the central monitoring server 430 has reached the minimum allowable pressure in the expansion tank 210 detected by the pressure sensor 282 installed in the expansion tank 210 data transmitted from the integrated control unit 260. If the data, the central monitoring server 430 transmits the driving command of the supply valve 252 installed in the pipe network connecting the pressure maintaining device 250 and the expansion tank 210 to the integrated control unit 260, the integrated control unit ( In operation 260, the supply valve 252 is operated according to the signal to supply the high pressure steam to the expansion tank 210.

That is, the pressure control unit 280 and the water level control unit 270 determine whether to supply the high pressure steam and the supply of the replenishment water according to the preset adjustment value, but when the integrated control unit 260 determines According to the signal transmitted from the central monitoring server 430, it is determined whether the supply of high-pressure steam and the supply of make-up water.

In addition, the central monitoring server 430 checks the data provided by the integrated control unit 260, and can determine the current state of the circulating air-conditioning device based on the confirmed data, and modify, delete the default setting value by this data , Storage, storage and so on.

In the cooling and heating system of the present invention configured as described above, as shown in FIG. 4, the pressure regulating means 220 for adjusting the pressure generated when the heat medium is introduced into the pressure regulating piping line 205 of the circulation piping line 206 is provided. It is provided to minimize the transient phenomenon that occurs when supplying the expanded circulation water to the expansion tank 210 to adjust the expansion pressure of the circulation pipe line 206, that is, but is not limited thereto.

Here, the pressure regulating means 220 is a pressure reducing valve 310 to control the pressure of the circulating water supplied from the circulation pipe line 206 to be supplied to the expansion tank 210, before and after the pressure reducing valve 310 Position of the manual valve 330 and the pressure reducing valve 310 which temporarily close the front and rear of the pressure reducing valve 310 so that the circulating water is not moved to the pressure reducing valve 310 when the pressure reducing valve 310 is repaired or replaced. (Repair or failure, etc.) also includes a variable valve 322 for supplying the circulation water of the circulation pipe line 206 to the expansion tank (210).

Here, the variable valve 322 is installed in the return pipe line 208 to be spaced apart from the pressure reducing valve 310 by a predetermined interval is preferably installed in a configuration in parallel with the pressure reducing valve 310.

In addition, the circulation pipe line 206 measures the expansion pressure in the circulation pipe line 206 and transmits the measured pressure to the controller 260 to determine whether the pressure reducing valve 310 is opened or closed. ) Is preferably configured, but is not limited thereto.

On the other hand, the circulation water pressure sensor 350 configured in the circulation pipe line 206 measures the expansion pressure in the circulation pipe line 206 and transmits a signal for the measured pressure to the integrated control unit 260, the integrated control unit 260 ) May determine whether to open or close the pressure reducing valve 310 according to the received signal.

The air-conditioning and heating system equipped with the hermetic expansion tank configured as described above and the control system of the expansion tank 210 through the remote control through the central monitoring server 430 and the integrated control unit 260, etc. By allowing management to be installed in a region where the expansion tank 210, such as mountainous areas are somewhat unreasonable, it is possible to save energy through efficient energy management and use, expansion tank 210 and the circulation pipe line ( A pressure control pipe line 205 and a pressure control means 220 are provided between the 206 to minimize the vibration, shock, etc. generated when the heat medium is supplied to the expansion tank 210 from the circulation pipe line 206 to the expansion tank. It is possible to improve the reliability of the expansion tank 210 by increasing the safety of the 210, the high pressure produced in the heat source facility 202, etc. as a medium for maintaining the pressure in the expansion tank 210 at a constant pressure By utilizing the device, it is possible to maintain the pressure of the expansion tank 210 even without a separate configuration for maintaining the pressure of the expansion tank 210 can reduce the installation cost of the expansion tank 210, the heat source facility 202 The high pressure steam generated in the back can be utilized to save energy.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a schematic view showing a circulation air-conditioning system having a closed expansion tank according to the prior art,

Figure 2 is a schematic view showing a circulating air-conditioning system with a closed expansion tank according to a preferred embodiment of the present invention,

Figure 3 is a block diagram schematically showing a circulating air-conditioning system having a closed expansion tank according to a preferred embodiment of the present invention,

Figure 4 is a schematic view showing a pressure regulating means according to a preferred embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

202: heat source facility 204: air conditioning unit

206: circulation piping line 208: recovery line

210: expansion tank 212: discharge line

214: discharge valve 220: pressure regulating means

240: supply water tank 242: water supply pump

250: nitrogen supply unit 260: integrated control unit

270: water level control unit 272: water level control sensor

280: pressure regulating control unit 282: pressure sensor

310: pressure reducing valve 322: variable valve

330: manual valve 350: circulating water pressure sensor

410: display unit 420: warning sound generating unit

430: central monitoring server

Claims (5)

Circulation cooling and heating with a closed expansion tank that connects a heat source facility and an air-conditioning device and includes an expansion tank installed at an end of a pressure control piping line installed at a branch pipe of the circulation pipe line and a circulation pump installed therein. In the system, A pressure maintaining device connected to the expansion tank through a pipe network and supplying a medium for maintaining the pressure of the expansion tank; A replenishment tank connected to the expansion tank, a replenishment line having a feedwater pump and a replenishment valve, and a recuperative line having a retrieval valve, respectively, and supplying replenishment water to the expansion tank according to the operation of the feedwater pump; A pressure regulating control unit for maintaining the pressure of the expansion tank in a constant state in association with a pressure sensor detecting the pressure in the expansion tank and the pressure of the medium supplied to the expansion tank; A level control controller installed in the expansion tank and the replenishment water tank, respectively, to adjust the level of the expansion tank and the replenishment water tank to an appropriate level by interlocking with a level control sensor for detecting a level; An integrated control unit controlling the pressure control unit and the water level control unit so that the pressure and the water level in the expansion tank and the water level in the replenishment tank are maintained in a constant state in association with the pressure control unit and the water level control unit; Circulating air conditioning system provided with a closed expansion tank comprising a. The method of claim 1, The centralized monitoring server for interlocking with the central monitoring server through the integrated control unit and the wired / wireless network, and analyzing the data by transmitting data transmitted from the pressure adjusting control unit and the water level adjusting control unit is further configured. Circulating air conditioning system with expansion tank. The method of claim 1, The integrated control unit is a circulation air-conditioning system having a closed expansion tank, characterized in that the interlocking with the display unit for displaying the data and the warning sound generating unit for notifying the signal for the data. The method of claim 1, The air-conditioning system with a closed expansion tank, characterized in that the pressure control means is installed in the pressure control pipe line is further configured to adjust the expansion pressure of the circulation pipe line. The method of claim 4, wherein The pressure control pipe line is a circulation air-conditioning system with a closed expansion tank characterized in that it comprises a pressure reducing valve for adjusting the expansion pressure of the circulation pipe line, and a variable valve for driving when the pressure reducing valve malfunctions.

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